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NASA’s Hubble and Webb Telescopes Reveal Two Faces of a Star Cluster Duo

2025-07-07 14:58

3 min read

NASA’s Hubble and Webb Telescopes Reveal Two Faces of a Star Cluster Duo

Bluish clouds of gas are wound through with red-glowing lanes and filaments of dust.. The clouds contain cavities filled with stars and many more stars are visible in the background and scattered throughout the clouds. The clouds are concentrated in the upper right and the lower middle of the image. Tiny background galaxies are also sprinkled throughout the image.

A vast network of stars, gas, and dust is strung among a duo of star clusters in this combined image from NASA’s Hubble and Webb space telescopes. Open clusters NGC 460 and NGC 456 reside in the Small Magellanic Cloud, a dwarf galaxy orbiting the Milky Way. This highly detailed 527 megapixel mosaic consists of 12 overlapping observations and includes both visible and infrared wavelengths. To view some of its incredible detail, download the 40.1 MB file and zoom in.

NASA, ESA, and C. Lindberg (The Johns Hopkins University); Processing: Gladys Kober (NASA/Catholic University of America)

A riotous expanse of gas, dust, and stars stake out the dazzling territory of a duo of star clusters in this combined image from NASA’s Hubble and Webb space telescopes.

Open clusters NGC 460 and NGC 456 reside in the Small Magellanic Cloud, a dwarf galaxy orbiting the Milky Way. Open clusters consist of anywhere from a few dozen to a few thousand young stars loosely bound together by gravity. These particular clusters are part of an extensive complex of star clusters and nebulae that are likely linked to one another. As clouds of gas collapse, stars are born. These young, hot stars expel intense stellar winds that shape the nebulae around them, carving out the clouds and triggering other collapses, which in turn give rise to more stars.

In these images, Hubble’s view captures the glowing, ionized gas as stellar radiation blows “bubbles” in the clouds of gas and dust (blue), while Webb’s infrared vision highlights the clumps and delicate filamentary structures of dust (red). In Hubble images, dust is often seen silhouetted against and blocking light, but in Webb’s view, the dust – warmed by starlight – shines with its own infrared glow. This mixture of gas and dust between the universe’s stars is known as the interstellar medium.

Hubble (ACS)

Webb (NIRCAM)

Bluish-white, bubble-shaped clouds of gas dominate this image, sprinkled with clusters of stars. Plentiful stars and some background galaxies are visible throughout the image. The gas clouds are concentrated in the upper right and lower middle of the image.

This Hubble image shows a duo of open clusters, NGC 460 and NGC 456. The nebulae’s glowing gas, ionized by the radiation of nearby stars, is distinct in Hubble’s view.

NASA, ESA, and C. Lindberg (The Johns Hopkins University); Processing: Gladys Kober (NASA/Catholic University of America)

Tendrils and filaments of dust glow red in this infrared image. The region is bright with myriad stars, star clusters, and background galaxies. The dust is concentrated in the upper right and middle of the image, as well as the lower left.

In Webb’s infrared view of open clusters NGC 460 and NGC 456, dusty areas are visible as bright structures glowing red. Many background galaxies are visible, their infrared light passing through the region’s obscuring clouds of gas and dust.

NASA, ESA, and C. Lindberg (The Johns Hopkins University); Processing: Gladys Kober (NASA/Catholic University of America)

This Hubble image shows a duo of open clusters, NGC 460 and NGC 456. The nebulae’s glowing gas, ionized by the radiation of nearby stars, is distinct in Hubble’s view.

NASA, ESA, and C. Lindberg (The Johns Hopkins University); Processing: Gladys Kober (NASA/Catholic University of America)

Hubble (ACS)

Webb (NIRCAM)

Hubble and Webb view a duo of open star clusters

Slide to switch between Hubble and Web images. Hubble’s view captures visible light and some infrared wavelengths, while Webb’s view is exclusively infrared. The nebulae’s glowing gas, ionized by the radiation of nearby stars, is distinct in Hubble’s view. Dusty areas that appear dark in the Hubble image are visible as bright structures in the Webb image, and more background galaxies are visible since infrared light from fainter and farther galaxies can pass through the obscuring clouds of gas and dust.

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The nodules visible in these images are scenes of active star formation, with stars ranging from just one to 10 million years old. In contrast, our Sun is 4.5 billion years old. The region that holds these clusters, known as the N83-84-85 complex, is home to multiple, rare O-type stars, hot and extremely massive stars that burn hydrogen like our Sun. Astronomers estimate there are only around 20,000 O-type stars among the approximately 400 billion stars in the Milky Way.

On the left is a Hubble image of NGC 460, showing bluish bubbles of gas and stars. On the right is a Webb telescope image of NGC 460, showing red filaments of dust and stars.

Clouds of ionized gas dominate open cluster NGC 460 in the Hubble image (left), while tendrils of dust are on display in the Webb image (right). Together, the two images provide a more comprehensive look at the region.

NASA, ESA, and C. Lindberg (The Johns Hopkins University); Processing: Gladys Kober (NASA/Catholic University of America)

On the left is a Hubble image of NGC 460, a round,bubble-shaped bluish cloud of gas and dust. On the right is a Webb telescope image of NGC 460, showing a cavern-like outline of red filaments of dust. Both are studded with stars.

The Hubble image of NGC 456 (left) shows a puffy, bluish cloud of ionized gas, while the Webb image (right) displays the same cluster’s cavern-like outline of dust.

NASA, ESA, and C. Lindberg (The Johns Hopkins University); Processing: Gladys Kober (NASA/Catholic University of America)

The Small Magellanic Cloud is of great interest to researchers because it is less enriched in metals than the Milky Way. Astronomers call all elements heavier than hydrogen and helium – that is, with more than two protons in the atom’s nucleus – “metals.” This state mimics conditions in the early universe, so the Small Magellanic Cloud provides a relatively nearby laboratory to explore theories about star formation and the interstellar medium at early stages of cosmic history. With these observations of NGC 460 and NGC 456, researchers intend to study how gas flows in the region converge or divide; refine the collision history between the Small Magellanic Cloud and its fellow dwarf galaxy, the Large Magellanic Cloud; examine how bursts of star formation occur in such gravitational interactions between galaxies; and better understand the interstellar medium.

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Media Contact:

Claire Andreoli
NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov

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Jul 07, 2025

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Aaisha Ali: From Marine Biology to the Artemis Control Room

2025-07-07 10:00

As humanity prepares to return to the lunar surface, Aaisha Ali is behind the scenes ensuring mission readiness for astronauts set to orbit the Moon during Artemis II.

Ali is the Artemis ground control flight lead at NASA’s Johnson Space Center in Houston. She makes sure her team has the resources needed for the next giant leap to the Moon and beyond.

A woman sits at a desk and poses in front of three monitors. Multiple monitors display live data and video of astronauts on the International Space Station. An American flag and NASA mission patches are visible on the wall behind her.

Aaisha Ali on console in the International Space Station Flight Control Room at NASA’s Johnson Space Center in Houston.

NASA/Robert Markowitz

My passion has always been science. I started by exploring the ocean, and now I get to help explore the stars.

Aaisha Ali

Artemis Ground Control Flight Lead

Ali received a bachelor’s degree in biology from Texas A&M University at Galveston before beginning a career as a marine biologist. Her curiosity about science and communication eventually led her from studying marine life to sharing NASA’s mission with the public. With a robust skill set that includes public relations, media relations, and strategic communications, she went on to work at Space Center Houston and later at Johnson on the protocol and digital imagery teams.

Today, Ali leads the ground control team supporting Artemis II, ensuring that systems, simulations, and procedures are ready for the mission. Her role includes developing flight rules, finalizing operations plans and leading training sessions – known as “network sims” – that prepare her team to respond quickly and effectively.

“Because I’ve had a multifaceted career path, it has given me a different outlook,” she said. “Diversity of mindsets helps us approach problems. Sometimes a different angle is exactly what we need.”

Aaisha Ali, right, with her two siblings.

Her perspective was also shaped by visits to her grandmother in the Caribbean as a child. “She lived in the tropical forest in a small village in Trinidad,” Ali said. “I was fortunate enough to spend summers on the island and experience a different way of life, which has helped me grow into the person I am today.”

Communication, she explained, is just as critical as technical expertise. “When we report to the flight director, we are the experts in our system. But we have to be clear and concise. You don’t get a lot of time on the flight loop to explain.”

That clarity, humility, and sense of teamwork are values Ali says have shaped her journey.

Eight people sit at a long table in front of their computers in a large facility. An airplane is parked behind them.

Aaisha Ali participates in a public affairs event at Ellington Field Joint Reserve Base in Houston in 2005.

We don’t do it by ourselves. Everyone — from our engineers to custodial staff to cafeteria workers — plays a role in getting us to the Moon. NASA is for the world. And it takes all of us.

Aaisha ali

Artemis Ground Control Flight Lead

Looking ahead, Ali is especially passionate about inspiring the Artemis Generation — those who will one day explore the Moon and Mars. She often shares advice with her nieces and nephews, including one determined nephew who has dreamed of becoming an astronaut since age 7.

“Do what you love, and NASA will find a place for you,” she said. “NASA is a big place. If you love the law, we have lawyers. If you love art, science, or technology, there’s a place for you. Passion is what we’re looking for.”

Aaisha Ali at Walt Disney World in Orlando, Florida.

In her free time, Ali enjoys photography and connecting with nature by camping and visiting national parks. She also loves planning trips to Walt Disney World, meeting new people, experiencing different cultures, and learning new things.

Even as her days are packed with simulations and mission prep, Ali knows landing astronauts on the lunar surface for Artemis III is not far behind.

“There’s a lot of uphill left to climb,” she said. “But we’re ready.”

NASA Remembers Former Johnson Director Jefferson Howell

2025-07-03 21:11

Former Johnson Director Jefferson Howell

July 3, 2025

Jefferson Davis Howell, Jr., former director of NASA’s Johnson Space Center in Houston, died July 2, in Bee Cave, Texas. He was 85 years old.

Howell was a champion of the construction of the International Space Station, working on a deadline to complete the orbiting lab by 2004. He oversaw four space shuttle crews delivering equipment and hardware to reach that goal. He also served as director during a pivotal moment for the agency: the loss of STS-107 and the crew of space shuttle Columbia. He made it his personal responsibility to meet with the families, look after them, and attend memorial services, all while keeping the families informed of the accident investigation as it unfolded.

“Gen. Howell led NASA Johnson through one of the most difficult chapters in our history, following the loss of Columbia and her crew,” said acting associate administrator Vanessa Wyche. “He brought strength and steady direction, guiding the workforce with clarity and compassion. He cared deeply for the people behind the mission and shared his leadership skills generously with the team. We extend our heartfelt condolences to his family and all who knew and loved him.”

At the time of his selection as director, he was serving as senior vice president with Science Applications International Corporation (SAIC) as the program manager for the safety, reliability, and quality assurance contract at Johnson. Following the accident, he made it his mission to improve the relationship between the civil servant and contractor workforce. He left his position and the agency, in October 2005, shortly after the Return-to-Flight mission of STS-114.

“General Howell stepped into leadership at Johnson during a pivotal time, as the International Space Station was just beginning to take shape. He led and supported NASA’s successes not only in space but here on the ground — helping to strengthen the center’s culture and offering guidance through both triumph and tragedy,” said Steve Koerner, Johnson Space Center’s acting director. “On behalf of NASA’s Johnson Space Center, we offer our deepest sympathies to his family, friends, and all those who had the privilege of working alongside him. The impact of his legacy will continue to shape Johnson for decades to come.”

The Victoria, Texas, native was a retired lieutenant general in the U.S. Marine Corps with a decorated military career prior to his service at NASA. He flew more than 300 combat missions in Vietnam and Thailand.

Howell is survived by his wife Janel and two children. A tree dedication will be held at NASA Johnson’s memorial grove in the coming year.

-end-

Chelsey Ballarte

Johnson Space Center, Houston

281-483-5111

chelsey.n.ballarte@nasa.gov

NASA Mission Monitoring Air Quality from Space Extended

2025-07-03 20:05

4 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

Since launching in 2023, NASA’s Tropospheric Emissions: Monitoring of Pollution mission, or TEMPO, has been measuring the quality of the air we breathe from 22,000 miles above the ground. June 19 marked the successful completion of TEMPO’s 20-month-long initial prime mission, and based on the quality of measurements to date, the mission has been extended through at least September 2026. The TEMPO mission is NASA’s first to use a spectrometer to gather hourly air quality data continuously over North America during daytime hours. It can see details down to just a few square miles, a significant advancement over previous satellites.

“NASA satellites have a long history of missions lasting well beyond the primary mission timeline. While TEMPO has completed its primary mission, the life for TEMPO is far from over,” said Laura Judd, research physical scientist and TEMPO science team member at NASA’s Langley Research Center in Hampton, Virginia. “It is a big jump going from once-daily images prior to this mission to hourly data. We are continually learning how to use this data to interpret how emissions change over time and how to track anomalous events, such as smoggy days in cities or the transport of wildfire smoke.”

By measuring nitrogen dioxide (NO2) and formaldehyde (HCHO), TEMPO can derive the presence of near-surface ozone. On Aug. 2, 2024 over Houston, TEMPO observed exceptionally high ozone levels in the area. On the left, NO2 builds up in the atmosphere over the city and over the Houston Ship Channel. On the right, formaldehyde levels are seen reaching a peak in the early afternoon. Formaldehyde is largely formed through the oxidation of hydrocarbons, an ingredient of ozone production, such as those that can be emitted by petrochemical facilities found in the Houston Ship Channel.

Trent Schindler/NASA's Scientific Visualization Studio

When air quality is altered by smog, wildfire smoke, dust, or emissions from vehicle traffic and power plants, TEMPO detects the trace gases that come with those effects. These include nitrogen dioxide, ozone, and formaldehyde in the troposphere, the lowest layer of Earth’s atmosphere.

“A major breakthrough during the primary mission has been the successful test of data delivery in under three hours with the help of NASA’s Satellite Needs Working Group. This information empowers decision-makers and first responders to issue timely air quality warnings and help the public reduce outdoor exposure during times of higher pollution,” said Hazem Mahmoud, lead data scientist at NASA’s Atmospheric Science Data Center located at Langley Research Center.

…the substantial demand for TEMPO's data underscores its critical role…

hazem mahmoud

NASA Data Scientist

TEMPO data is archived and distributed freely through the Atmospheric Science Data Center. “The TEMPO mission has set a groundbreaking record as the first mission to surpass two petabytes, or 2 million gigabytes, of data downloads within a single year,” said Mahmoud. “With over 800 unique users, the substantial demand for TEMPO’s data underscores its critical role and the immense value it provides to the scientific community and beyond.” Air quality forecasters, atmospheric scientists, and health researchers make up the bulk of the data users so far.

On April 14, strong winds triggered the formation of a huge dust storm in the U.S. central plains and fueled the ignition of grassland fires in Oklahoma. On the left, the NO2 plumes originating from the grassland fires are tracked hour-by-hour by TEMPO. Smoke can be discerned from dust as a source since dust is not a source of NO2. The animation on the right shows the ultraviolet (UV) aerosol index, which indicates particulates in the atmosphere that absorb UV light, such as dust and smoke.

Trent Schindler/NASA's Scientific Visualization Studio

The TEMPO mission is a collaboration between NASA and the Smithsonian Astrophysical Observatory, whose Center for Astrophysics Harvard & Smithsonian oversees daily operations of the TEMPO instrument and produces data products through its Instrument Operations Center.

Datasets from TEMPO will be expanded through collaborations with partner agencies like the National Oceanic and Atmospheric Administration (NOAA), which is deriving aerosol products that can distinguish between smoke and dust particles and offer insights into their altitude and concentration.

On May 5, TEMPO measured NO2 emissions over the Twin Cities in the center of Minnesota during morning rush hour. The NO2 increases seen mid-day through the early evening hours are illustrated by the red and black shaded areas at the Red River Valley along the North Dakota state line. These levels are driven by emissions from the soils in agriculturally rich areas. Agricultural soil emissions are influenced by environmental factors like temperature and moisture as well as fertilizer application. Small fires and enhancements from mining activities can also be seen popping up across the region through the afternoon.

Trent Schindler/NASA's Scientific Visualization Studio

“These datasets are being used to inform the public of rush-hour pollution, air quality alerts, and the movement of smoke from forest fires,” said Xiong Liu, TEMPO’s principal investigator at the Center for Astrophysics Harvard & Smithsonian. “The library will soon grow with the important addition of aerosol products. Users will be able to use these expanded TEMPO products for air quality monitoring, improving forecast models, deriving pollutant amounts in emissions and many other science applications.”

A map of North America shows several wide swaths of purple illustrating smoke in the atmosphere as measured by NASA's TEMPO instrument during wildfires in Manitoba from June 2, 2025.

The TEMPO mission detects and highlights movement of smoke originating from fires burning in Manitoba on June 2. Seen in purple hues are observations made by TEMPO in the ultraviolet spectrum compared to Advanced Baseline Imagers (ABIs) on NOAA’s GOES-R series of weather satellites that do not have the needed spectral coverage. The NOAA GOES-R data paired with NASA’s TEMPO data enhance state and local agencies’ ability to provide near-real-time smoke and dust impacts in local air quality forecasts.

NOAA/NESDIS/Center for Satellite Applications and Research

“The TEMPO data validation has truly been a community effort with over 20 agencies at the federal and international level, as well as a community of over 200 scientists at research and academic institutions,” Judd added. “I look forward to seeing how TEMPO data will help close knowledge gaps about the timing, sources, and evolution of air pollution from this unprecedented space-based view.”

An agency review will take place in the fall to assess TEMPO’s achievements and extended mission goals and identify lessons learned that can be applied to future missions.

The TEMPO mission is part of NASA’s Earth Venture Instrument program, which includes small, targeted science investigations designed to complement NASA’s larger research missions. The instrument also forms part of a virtual constellation of air quality monitors for the Northern Hemisphere which includes South Korea’s Geostationary Environment Monitoring Spectrometer and ESA’s (European Space Agency) Sentinel-4 satellite. TEMPO was built by BAE Systems Inc., Space & Mission Systems (formerly Ball Aerospace). It flies onboard the Intelsat 40e satellite built by Maxar Technologies. The TEMPO Instrument Operations Center and the Science Data Processing Center are operated by the Smithsonian Astrophysical Observatory, part of the Center for Astrophysics | Harvard & Smithsonian in Cambridge.

For more information about the TEMPO instrument and mission, visit:

https://science.nasa.gov/mission/tempo/

About the Author

Charles G. Hatfield

Science Public Affairs Officer, NASA Langley Research Center

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Hubble Observations Give “Missing” Globular Cluster Time to Shine

2025-07-03 20:00

2 min read

Hubble Observations Give “Missing” Globular Cluster Time to Shine

Bright stars cluster against a black background. The stars are more densely concentrated in the center of the image. The stars appear mostly white, but bright red and blue stars are also visible sprinkled throughout the image.

This NASA Hubble Space Telescope image features a dense and dazzling array of blazing stars that form globular cluster ESO 591-12.

NASA, ESA, and D. Massari (INAF — Osservatorio di Astrofisica e Scienza dello Spazio); Processing: Gladys Kober (NASA/Catholic University of America)

A previously unexplored globular cluster glitters with multicolored stars in this NASA Hubble Space Telescope image. Globular clusters like this one, called ESO 591-12 or Palomar 8, are spherical collections of tens of thousands to millions of stars tightly bound together by gravity. Globular clusters generally form early in the galaxies’ histories in regions rich in gas and dust. Since the stars form from the same cloud of gas as it collapses, they typically hover around the same age. Strewn across this image of ESO 591-12 are a number of red and blue stars. The colors indicate their temperatures; red stars are cooler, while the blue stars are hotter.

Hubble captured the data used to create this image of ESO 591-12 as part of a study intended to resolve individual stars of the entire globular cluster system of the Milky Way. Hubble revolutionized the study of globular clusters since earthbound telescopes are unable to distinguish individual stars in the compact clusters. The study is part of the Hubble Missing Globular Clusters Survey, which targets 34 confirmed Milky Way globular clusters that Hubble has yet to observe.

The program aims to provide complete observations of ages and distances for all of the Milky Way’s globular clusters and investigate fundamental properties of still-unexplored clusters in the galactic bulge or halo. The observations will provide key information on the early stages of our galaxy, when globular clusters formed.

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NASA’s Goddard Space Flight Center, Greenbelt, MD
claire.andreoli@nasa.gov

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NASA’s Hubble and Webb Telescopes Reveal Two Faces of a Star Cluster Duo

Hubble and Webb view a duo of open star clusters

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My passion has always been science. I started by exploring the ocean, and now I get to help explore the stars.

We don’t do it by ourselves. Everyone — from our engineers to custodial staff to cafeteria workers — plays a role in getting us to the Moon. NASA is for the world. And it takes all of us.

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Preparations for Next Moonwalk Simulations Underway (and Underwater)

…the substantial demand for TEMPO's data underscores its critical role…

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